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The answer is acidic.
pH < 7 = acidic
pH > 7 base
Answer:
Partial pressure of dinitrogen tetroxide after equilibrium is reached the second time is 0.82 atm.
Explanation:

Initially
3.0 atm 0
At equilibrium
(3.0-2p) p
Equilibrium partial pressure of 
p = 0.45 atm
The value of equilibrium constant wil be given by :


After addition of 1.5 atm of nitrogen dioxide gas equilibrium reestablishes it self :

After adding 1.5 atm of
:
(2.1+1.5) atm 0.45 atm
At second equilibrium:'
(3.6-2P) (0.45+P)
The expression of equilibrium can be written as:


Solving for P:
P = 0.37 atm
Partial pressure of dinitrogen tetroxide after equilibrium is reached the second time:
= (0.45+P) atm = (0.45 + 0.37 )atm = 0.82 atm
Partial pressure of dinitrogen tetroxide after equilibrium is reached the second time is 0.82 atm.
The oxidation number of a pure element is zero.
The double and triple bond present in the molecule determines the shape of the molecule because the strength of the bond may tend to allow the bending in the molecule thus, revealing a different orientation. An example of this is sulfur dioxide (SO₂) which is a trigonal planar.